def register(self,client):
        rid = User2Room[client.peer]
        room = rooms[rid]
        room.addUser(client)
        print("number of client= "+str(room.numberOfClients()))
        if room.numberOfClients()==1:
        	client.sendMessage("initiator")
    	elif room.numberOfClients()==2:
    		client.sendMessage("not initiator")
    	else:
    		client.sendMessage("only 2 clients can connect")